Anthony Williams <[EMAIL PROTECTED]> writes: > Thomas Becker <[EMAIL PROTECTED]> writes: > > I see now that with your tuple iterator, you are > > aiming much higher than I previously thought. Just > > like boost's transform iterators, my combining > > iterators are always and necessarily input iterators. > > (That's not really going to change under the new > > proposed iterator categories, although they'll help > > me.) I can cheat a little by returning a value that > > happens to hold a bunch of references, such as a > > boost::tuple of references. Nothing prevents me from > > doing that. But you want a parallel-iterator that one > > can, for example, pass to std::sort and have it order > > the underlying sequences lexicographically. That's a > > tall order. My combining iterator does not cover that. > > Neither do I think that my combining iterator is > > affected much by the ultimate solution to your > > problem. My combining iterator is a multi-dimensional > > boost::transforming_iterator. Yours would end up being > > a multi-dimensional boost::projection_iterator. That's > > a different colored horse. > > Yes, it's different, but it still has the same underlying parallel-iteration > problems to solve, so there might be some common ground. Which is what I've > been trying to say all along, though I didn't really state that in plain > text. It might be that the common ground is at a lower level than the iterator > dereferencing which has been focussing our attention, and it might be that > there is sufficiently little to make it not worth sharing, but I thought it > worth exploring.
FWIW, I've extended my pair iterator to be a tuple iterator for input/forward/bidirectional/random-access iterator categories, which was relatively painless. I will boostify it, add output iterator support back in, and test it with VC7.1 as well as g++ 3.2.2, if you (or anyone else) are interested. Anthony -- Anthony Williams Senior Software Engineer, Beran Instruments Ltd. Remove NOSPAM when replying, for timely response. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
